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Algebra please please help

Factor completely. 25x^2 + 40xy + 16y^2

Factor. s^2(t – u) – 9t^2(t – u)

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1 Answer

For the top: Hint: a2 + 2ab + b2 = (a+b)

For the bottom: factor out (t-u) from both terms to get (t-u)(s2 - 9t2). Factor the second set of parentheses. (Hint: Difference of two squares)